(function () {

    $(".box1").click(function () {
        var num = parseInt(Math.random() * 4 + 1)
        if (num == 1) {
            $(".box1").children("img").attr({ src: `./images/ZCimg/captcha.gif` })
        } else if (num == 2) {
            $(".box1").children("img").attr({ src: `./images/ZCimg/captcha2.png` })
        } else if (num == 3) {
            $(".box1").children("img").attr({ src: `./images/ZCimg/captcha3.gif` })
        }else if(num==4){
            $(".box1").children("img").attr({ src: `./images/ZCimg/captcha4.png` })
        }else{
            $(".box1").children("img").attr({ src: `./images/ZCimg/captcha5.gif` })
        }
    })
})()